Weight gain is an increase in body weight. This can be a result of increases to muscle mass, increases in body fat, or increases in body fluids like water. Occasionally, weight gain can be a symptom of an underlying medical problem.
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3

Want off medication:
I am not sure of your age, so that makes it difficult to answer your question. Having an honest discussion with your doctor is needed, and this is also needed with your dad. The medication may be helping you, and this is likely why there is hesitation for you to come off the medication. So, start with an honest discussion with your dad and your doctor. Consider a slow taper of your medication
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4

Yes, maybe, yes, no:
It is an anti-anxiety drug and for some it does seem to increase appetite and result in weight gain and it is to be taken regularly as directed - it is not a PRN-type (for the moment) medication. Discuss this at length w/ your doctor and if they are not experts - ask for a referral to have your needs evaluated. Add therapy to optimize effectiveness of any drug tx. Best!
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Unlikely:
Weight gain is listed as an uncommon (~1%) side effect of Buspar (buspirone). If this has been recommended by your doctor for GAD, it's worth trying. Monitor your weight and let doc know if you're concerned and stop med if it's a problem. Bottom line: Buspar (buspirone) is not associated with weight gain. I hope this helps.
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Sleeping medications:
Antipsychotic medications like Zyprexa (olanzapine) should not be used for sleep. There are other medications that can help with sleep that do not have the side effects of Zyprexa (olanzapine). Also, there are many other non-drug treatments that should be tried too. Sleep hygiene is very important.
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7

Sleeping medication:
I tend to gravitate toward prescribing the older sleeping agents like Flurazepam and Temazepam. They seem to be more effective at keeping you asleep. They are also much less expensive and do not induce sleepwalking like Ambien (zolpidem) does.
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9

Possible side effect:
Based on the symptoms you are experiencing, this might not be a good medication combination for you. Individuals can differ in terms of what medication combinations and doses work for them. Venlafaxine (Effexor) can cause people's blood pressure to increase. Too much serotonin (which is one of the brain chemicals that these 3 medications affect), can cause excessive sweating as well.
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